diff options
| -rw-r--r-- | fs/open.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/open.c b/fs/open.c index 1091dadd6c38..7d02d19bd0a2 100644 --- a/fs/open.c +++ b/fs/open.c @@ -890,6 +890,10 @@ EXPORT_SYMBOL(filp_open); * a fully instantiated struct file to the caller. * This function is meant to be called from within a filesystem's * lookup method. + * Beware of calling it for non-regular files! Those ->open methods might block + * (e.g. in fifo_open), leaving you with parent locked (and in case of fifo, + * leading to a deadlock, as nobody can open that fifo anymore, because + * another process to open fifo will block on locked parent when doing lookup). * Note that in case of error, nd->intent.open.file is destroyed, but the * path information remains valid. * If the open callback is set to NULL, then the standard f_op->open() |